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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Cross platform methods for FilePathWatcher. See the various platform
// specific implementation files, too.
#include "base/files/file_path_watcher.h"
#include "base/logging.h"
#include "base/message_loop.h"
namespace base {
namespace files {
namespace {
// A delegate implementation for the callback interface.
class FilePathWatcherDelegate : public base::files::FilePathWatcher::Delegate {
public:
explicit FilePathWatcherDelegate(const FilePathWatcher::Callback& callback)
: callback_(callback) {}
// FilePathWatcher::Delegate implementation.
virtual void OnFilePathChanged(const FilePath& path) OVERRIDE {
callback_.Run(path, false);
}
virtual void OnFilePathError(const FilePath& path) OVERRIDE {
callback_.Run(path, true);
}
private:
virtual ~FilePathWatcherDelegate() {}
FilePathWatcher::Callback callback_;
DISALLOW_COPY_AND_ASSIGN(FilePathWatcherDelegate);
};
} // namespace
FilePathWatcher::~FilePathWatcher() {
impl_->Cancel();
}
// static
void FilePathWatcher::CancelWatch(
const scoped_refptr<PlatformDelegate>& delegate) {
delegate->CancelOnMessageLoopThread();
}
bool FilePathWatcher::Watch(const FilePath& path, Delegate* delegate) {
DCHECK(path.IsAbsolute());
return impl_->Watch(path, delegate);
}
FilePathWatcher::PlatformDelegate::PlatformDelegate(): cancelled_(false) {
}
FilePathWatcher::PlatformDelegate::~PlatformDelegate() {
DCHECK(is_cancelled());
}
bool FilePathWatcher::Watch(const FilePath& path, const Callback& callback) {
return Watch(path, new FilePathWatcherDelegate(callback));
}
} // namespace files
} // namespace base
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